Hardened OS

["Matthew Cable" <mec @ itg . net>]

I'm in the process of developing and building my own homebrew firewall system,
and am looking for some educated opinions.  If you were going to choose an OS
to 'harden' to lay a firewall on, what would it be.  I'm currently leaning
towards BSDI, but want others views on this.  The ideal solution would require
little additional work to 'harden' and wouldn't cost an arm and a leg.

Thanks!

-- 
- Matthew E Cable / Systems Administrator / Internet Technologies Group, Inc.